|The Very Highest Quality Turquoise Information...|
Tuquoise is an opaque blue to greenish gemstone, a hydrous phosphate of aluminium, with some copper and iron.
It is believed that it got its name from the French word for Turkish (turquois), from a popular misconception that the stone originated from Turkey. This would have been because it was traded in Turkey, by Turkish merchants who had sourced it from Persia. It was also used extensively in Turkey to decorate mosques, palaces, and other important buildings and homes. Turkish dealers sold it to Venetian merchants, who brought it to Europe.
Although it's crystal structure is triclinic, it rarely forms large crystals, and is said to be cryptocrystalline.
It is also usually found with patches of white matrix interspersed, which tends to be less attractive, and reduces its value.
The colour turquoise is named after the gemstone. The best specimens are a beautiful light blue stone, with green overtones. In general, the more green the stone, the less attractive it is considered.
Unfortunately, turquoise will tend to become greener with age, due to exposure to heat, light, dirt, grease, and chemical attack.
Historically, most turquoise came from Persia, now Iran, which is still the source of most of the world's best turquoise. It is also found in Egypt, Turkestan, and the USA.
|Chemical Composition||CuAl6(PO4)4(OH8. 4H20|
The copper (Cu) is often partially replaced by Iron (Fe)
|Chemical Name||Hydrous Cupro Alumium Phosphate|
|Hardness||6, Variable 5 to 6|
|Refractive Index||1.61 to 1.65|
|Crystalline System||Triclinic, Cryptocrystalline|
|Gemstone||Weight||Shape||Size & Description||Available||Price £||Price $|
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